An explanation for the isotopic offset between soil and stem water in a temperate tree species
A growing number of field studies report isotopic offsets between stem water and its potential sources that prevent the unambiguous identification of plant water origin using water isotopes. We explored the causes of this isotopic offset by conducting a controlled experiment on the temperate tree sp...
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ftunivpaisvasco:oai:addi.ehu.es:10810/47398 2023-05-15T17:54:00+02:00 An explanation for the isotopic offset between soil and stem water in a temperate tree species Barbeta, A. Gimeno, T.E. Clavé, L. Fréjaville, B. Jones, S.P. Delvigne, C Wingate, L. Ogée, J. European Commission Aquitaine Region, French national research agency, FP7/2007, French national programme EC2CO-Biohefect, European Research Council, IdEx Bordeaux, EU Seventh Framework Program, ANR-13-BS06-0005-01 2020 http://hdl.handle.net/10810/47398 eng eng New Phytologist Trust info:eu-repo/grantAgreement/EC/FP7/338264 https://dx.doi.org/10.1111/nph.16564 New Phytologist 227(3) : 766-779 (2020) 0028-646X http://hdl.handle.net/10810/47398 info:eu-repo/semantics/openAccess © 2020 The Authors. New Phytologist © 2020 New Phytologist Trust ecohydrology Fagus sylvatica plant water sources root water uptake water isotopes info:eu-repo/semantics/article 2020 ftunivpaisvasco https://doi.org/10.1111/nph.16564 2022-03-10T16:39:29Z A growing number of field studies report isotopic offsets between stem water and its potential sources that prevent the unambiguous identification of plant water origin using water isotopes. We explored the causes of this isotopic offset by conducting a controlled experiment on the temperate tree species Fagus sylvatica. We measured d2H and d18O of soil and stem water from potted saplings growing on three soil substrates and subjected to two watering regimes. Regardless of substrate, soil and stem water d2H were similar only near permanent wilting point. Under moister conditions, stem water d2H was 11 ± 3 more negative than soil water d2H, coherent with field studies. Under drier conditions, stem water d2H became progressively more enriched than soil water d2H. Although stem water d18O broadly reflected that of soil water, soil stem d2H and d18O differences were correlated (r = 0.76) and increased with transpiration rates indicated by proxies. Soil stem isotopic offsets are more likely to be caused by water isotope heterogeneities within the soil pore and stem tissues, which would be masked under drier conditions as a result of evaporative enrichment, than by fractionation under root water uptake. Our results challenge our current understanding of isotopic signals in the soil plant continuum. © 2020 The Authors. New Phytologist © 2020 New Phytologist Trust This work was supported by the French national programme EC2CO-Biohefect (RootWater), the French national research agency (projects Hydrobeech, Climbeech and Micromic within the Cluster of Excellence COTE with grant agreement ANR-10-LABX-45; project ORCA with grant agreement ANR-13-BS06-0005-01), the European Research Council (ERC) under the EU Seventh Framework Program (FP7/2007-2013, with grant agreement no. 338264, awarded to LW) and the Aquitaine Region (project Athene with grant agreement 2016-1R20301-00007218). AB also acknowledges an IdEx Bordeaux postdoctoral fellowship from the Universite de Bordeaux (contract no. 22001162). Article in Journal/Newspaper Orca ADDI: Repositorio Institucional de la Universidad del País Vasco (UPV) New Phytologist 227 3 766 779 |
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ADDI: Repositorio Institucional de la Universidad del País Vasco (UPV) |
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ftunivpaisvasco |
language |
English |
topic |
ecohydrology Fagus sylvatica plant water sources root water uptake water isotopes |
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ecohydrology Fagus sylvatica plant water sources root water uptake water isotopes Barbeta, A. Gimeno, T.E. Clavé, L. Fréjaville, B. Jones, S.P. Delvigne, C Wingate, L. Ogée, J. An explanation for the isotopic offset between soil and stem water in a temperate tree species |
topic_facet |
ecohydrology Fagus sylvatica plant water sources root water uptake water isotopes |
description |
A growing number of field studies report isotopic offsets between stem water and its potential sources that prevent the unambiguous identification of plant water origin using water isotopes. We explored the causes of this isotopic offset by conducting a controlled experiment on the temperate tree species Fagus sylvatica. We measured d2H and d18O of soil and stem water from potted saplings growing on three soil substrates and subjected to two watering regimes. Regardless of substrate, soil and stem water d2H were similar only near permanent wilting point. Under moister conditions, stem water d2H was 11 ± 3 more negative than soil water d2H, coherent with field studies. Under drier conditions, stem water d2H became progressively more enriched than soil water d2H. Although stem water d18O broadly reflected that of soil water, soil stem d2H and d18O differences were correlated (r = 0.76) and increased with transpiration rates indicated by proxies. Soil stem isotopic offsets are more likely to be caused by water isotope heterogeneities within the soil pore and stem tissues, which would be masked under drier conditions as a result of evaporative enrichment, than by fractionation under root water uptake. Our results challenge our current understanding of isotopic signals in the soil plant continuum. © 2020 The Authors. New Phytologist © 2020 New Phytologist Trust This work was supported by the French national programme EC2CO-Biohefect (RootWater), the French national research agency (projects Hydrobeech, Climbeech and Micromic within the Cluster of Excellence COTE with grant agreement ANR-10-LABX-45; project ORCA with grant agreement ANR-13-BS06-0005-01), the European Research Council (ERC) under the EU Seventh Framework Program (FP7/2007-2013, with grant agreement no. 338264, awarded to LW) and the Aquitaine Region (project Athene with grant agreement 2016-1R20301-00007218). AB also acknowledges an IdEx Bordeaux postdoctoral fellowship from the Universite de Bordeaux (contract no. 22001162). |
author2 |
European Commission Aquitaine Region, French national research agency, FP7/2007, French national programme EC2CO-Biohefect, European Research Council, IdEx Bordeaux, EU Seventh Framework Program, ANR-13-BS06-0005-01 |
format |
Article in Journal/Newspaper |
author |
Barbeta, A. Gimeno, T.E. Clavé, L. Fréjaville, B. Jones, S.P. Delvigne, C Wingate, L. Ogée, J. |
author_facet |
Barbeta, A. Gimeno, T.E. Clavé, L. Fréjaville, B. Jones, S.P. Delvigne, C Wingate, L. Ogée, J. |
author_sort |
Barbeta, A. |
title |
An explanation for the isotopic offset between soil and stem water in a temperate tree species |
title_short |
An explanation for the isotopic offset between soil and stem water in a temperate tree species |
title_full |
An explanation for the isotopic offset between soil and stem water in a temperate tree species |
title_fullStr |
An explanation for the isotopic offset between soil and stem water in a temperate tree species |
title_full_unstemmed |
An explanation for the isotopic offset between soil and stem water in a temperate tree species |
title_sort |
explanation for the isotopic offset between soil and stem water in a temperate tree species |
publisher |
New Phytologist Trust |
publishDate |
2020 |
url |
http://hdl.handle.net/10810/47398 |
genre |
Orca |
genre_facet |
Orca |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/338264 https://dx.doi.org/10.1111/nph.16564 New Phytologist 227(3) : 766-779 (2020) 0028-646X http://hdl.handle.net/10810/47398 |
op_rights |
info:eu-repo/semantics/openAccess © 2020 The Authors. New Phytologist © 2020 New Phytologist Trust |
op_doi |
https://doi.org/10.1111/nph.16564 |
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New Phytologist |
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227 |
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3 |
container_start_page |
766 |
op_container_end_page |
779 |
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1766161706724098048 |